Review of the Hanford Thyroid Disease Study Draft Final Report (2000) / Chapter Skim
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Appendix B: Responses to Selected Comments by the Public
Appendix B: Responses to Selected Comments by the Public
Pages 168-175
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From page 168... ...
The hourly meteorologic data from the 16 stations in the geographic area roughly reflect the effects of the Cascade range, the Blue Mountains south of WalIa Walla, and the Bitterroot Mountain range east of Spokane, Coeur d'A1ene, and Lewiston. The modeling of terrain effects in a more detailed manner is impeded by the severe limitations of the meteorologic data that are available for the mode]
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From page 169... ...
Response: iodized salt was widely available by the 1940s, so low dietary iodine might have been an issue only in some unidentified and probably small subset of children in that era. Development of thyroid disease related to iodine deficiency typically takes a number of years of low iodine intake.
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From page 170... ...
Response: Perinatal mortality (death rate during the first month of life) and mortality due to birth defects (congenital anomalies)
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From page 171... ...
Two studies of ~3~T administered to young people for diagnostic medical purposes have not shown statistically significant excesses of thyroid cancer (Holm, 1991; Hamilton and others, 1989~. The average thyroid doses in the two studies were about 800 and 1500 mGy.
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From page 172... ...
They could be right, and their disease could have been the result of unusual fallout or ingestion patterns. However, it is also true that thyroid disease tends to run in families, and the particular occurrences could be related to genetic factors in the families, chance, or even mistaken diagnoses.
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From page 173... ...
Hence, we have much uncertainty about the size of screening effects. That is one of the reasons that it was more appropriate to compare disease rates within the study population, in which everyone underwent screening, than between this study population and some other, mostly unscreened population.
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From page 174... ...
. However, it is generally believed that nit is less effective in causing thyroid disease than are x-rays, and this might be especially true when the 13~{ doses are spread out over several years (dose protraction tends to reduce the amount of cell damage that cells cannot repair)
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From page 175... ...
and 0.5-~.0 Gy (50-100 red) , although there is a suggestion that ill} is only about 50°/0 as effective as gamma rays in inducing thyroid cancer (Jacob and others, 1998~.
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